<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒模型</title>
    <style>
        div.box1 {
            width: 100px;
            height: 100px;
            background-color: rosybrown;
            border: 2px solid rgb(0, 255, 115);
            padding: 10px;
        }
    </style>
</head>

<body>
    <div class="box1">
        盒模型
    </div>
</body>

</html>